Improved mode of setting artificial teeth



UNITED STATES PATENT OEEICE.

DAVID STEINBERG, OF SAN FRANCISCO, CALIFORNIA.

IMPROVED MODE OF SETTING ARTIFICIAL TEETH.

Specication forming part of Letters Patent No. 33,716, dated November 12, 1861,

To all whom, t may concern,.-

Be it known that I, DAvID STEINBERG, of the city of San Francisco, in the county of San Francisco and State of California, have in- `vented a new and useful Improvement in Setting Artificial Teeth; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in Which- Figure l is a side view ot' an upper set of teeth set according to my invention; Fig. 2, an under side view of the same; Fig. 3, a central section of the same from back to front; and Fig. 4 a transverse section, as indicated by the line :n in Fig. 2.

Similar letters of reference indicate corresponding parts in theseveral figures.

This invention consists in a certain mode of combining the teeth with a gold, platinum, or other metal plate by means of india-rubber or other vulcanizable gum, whereby all solder! ing and riveting, by Which the plate is liable to be warped,is dispensed with, and the gum, when vulcanized, is made to serve as a means of strengthening and preserving the form of the plate.

To` enable others skilled in the art to apply my invention to use, I will proceed to describe it with reference to the drawings.

I rst take the impression of the mouth, then make the mold and metal cast, in which I obtain the plateA to fit the mouth, all in the manner commonly practiced by dentists when the teeth are to be mounted on the plate in the usual manner, such plate, however, being made of much thinner metal than is used when the india-rubber is not used. I then .turn the'rear edge of the plate forward over its face, as shown at at in Figs. 2 and 3, and turn over the front and side edges b b, as shown in Figs. 3 and 4, to make it hold the india-rubber c c', Which is tinted ot' red color in the several gures. When the plate A has been made, I take the articulation in the usual way and arrange the teeth B B upon the plate, the teeth being formed with pins or hooks d to hold the india-rubber. I then apply WaX to the plate and teeth Where the india-rubber c c is required-that is to say, I spread it of the thickness desired for the rubber. I then take in one of the two vulcanizing-asks an impression in plaster of the back or uncovered surface of the plate A, and when the plaster is set oil the surface of the portion remaining around the outside of the plate, and While the plate remains in this flask I put the other flask on the top of it and ll it with plaster, entirely covering the plate, teeth, and Wax, having previously oiled the Wax to prevent the plaster sticking to it. Having now obtained a perfect lnold of the plates, teeth, and wax, I separate the liasks, and the teeth, not having been oiled, are left sticking in the plaster in the upper Iiask When the flasks are separated. I then take the plate A and remove all the Wax from it and apply the india-rubber, which -has been prepared for vulcanization, to the portions of the plate formerly occupied by the wax in such quantity as is required, and place the plate back in the firsttlask, and then press the two flasks together in such manner as to impress theindia-rubber firmly into the plate and the plate firmly into the impression in the first iask, that the proper shape may be perfectly retained. I next place them in the vulcanizing-oven. After vulcanization has been effected I remove the asks from the oven and separate them, and in this separation the teeth easily leave the plaster in which they were held While the india-rubber was being applied to the plate, and noW remain iirmly and permanently united to the plate by means of the india-rubber.

The principal advantages of this mode of combining the teeth with the plate by means of india-rubber or other gum capable of vulcanization are, first, that all soldering and riveting', whereby the plate is liable to be Warped and a misfit or imperfect fit produced, is dispensed with; second, that I do not require any special construction ot the teeth, but can use any kind;` third,that by covering the plate entirely with gum it is lnuch strengthcned.

I do not claim, broadly, the employment of india-rubber to unite the teeth to the plate; but

Vhat I claim as my invention, and desire to secure by Letters Patent, is

Combining the teeth With the gold, platinum, or other metal plate by means of indiarubber or other gum capable of vulcanization, applied in the manner herein specified.

DAVID STEINBERG. Witnesses:

JAMES LAIRD, M. M. LIVINGSTON. 

